The Poison Mushroom (aka Poison Shroom) is a trap item / power-down item from the Super Mario series, this particular one appears in Luigi's Mansion - when consumed it makes Luigi small and lose coins and pearls.

The Deepsea Challenger sub is a high tech manned submersible that recently made historic expedition to the Mariana Trench’s lowest point, the Challenger Deep, which lies 6.83 miles (11 kilometers) below the ocean's surface.